ISDA: 1PJ9

Deposition Date 2003-06-02

Release Date 2004-02-03

Last Version Date 2024-11-06

Entry Detail

PDB ID:

1PJ9

Keywords:

TRANSFERASE

Title:

Bacillus circulans strain 251 loop mutant 183-195

Biological Source:

Source Organism(s):

Bacillus circulans (Taxon ID: 1397)

Expression System(s):

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.00 Å

R-Value Free:

0.17

R-Value Work:

0.15

R-Value Observed:

0.15

Space Group:

P 21 21 21

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Cyclomaltodextrin glucanotransferase
Gene (Uniprot):cgt
Mutagens:T185S, T186Y, N188D, K192R
Chain IDs:A
Chain Length:686
Number of Molecules:1
Biological Source:Bacillus circulans

UniProt ID:P43379 Pfam ID:PF00128, PF02806, PF01833, PF00686 EC:2.4.1.19

Ligand Molecules

ACY

GLC

MPD

Peptide-like Molecules

PRD_900001

PRD_900009

Primary Citation

Improved thermostability of bacillus circulans cyclodextrin glycosyltransferase by the introduction of a salt bridge

Leemhuis, H, Rozeboom, H.J, Dijkstra, B.W, Dijkhuizen, L.Show

PROTEINS: STRUCT.,FUNCT.,GENET. 54 128 134 (2004)

PMID: 14705029 DOI: 10.1002/prot.10516

Abstact

Cyclodextrin glycosyltransferase (CGTase) catalyzes the formation of cyclodextrins from starch. Among the CGTases with known three-dimensional structure, Thermoanaerobacterium thermosulfurigenes CGTase has the highest thermostability. By replacing amino acid residues in the B-domain of Bacillus circulans CGTase with those from T. thermosulfurigenes CGTase, we identified a B. circulans CGTase mutant (with N188D and K192R mutations), with a strongly increased activity half-life at 60 degrees C. Asp188 and Arg192 form a salt bridge in T. thermosulfurigenes CGTase. Structural analysis of the B. circulans CGTase mutant revealed that this salt bridge is also formed in the mutant. Thus, the activity half-life of this enzyme can be enhanced by rational protein engineering.

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Disease

Primary Citation of related structures

Abstact

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